Toyota Tacoma upgrades

[DD977GM2]

Hey all

I have been out of the auto world for awhile as far as customization and upgrades are concerned. I have forgotten plenty of things that one can do to a vehicle for performance, looks and stupidity alike.
Im wondering from those in the know what can I realistically do to improve MPG for my 2007 Tacoma 4x4 ext cab.
I will be driving in the oilfield and cant be to crazy due to constant mud and dirt I will be driving though.
Im thinking with getting a better air intake and what else can I do to do minor upgrades.

Appreciate the help and here is a pic of me on some rig road in middle of nowhere south of Vernal, UT.

As for those saying get a real truck, Ill take my Taco anywhere that your "American" Union scum made truck will go and then some.
I WILL NEVER PURCHASE AN AMERICAN TRUCK AGAIN IN MY LIFE.
I have specific reasons, one they are made in Mexico or in factories strangled by Unions and also the reliabilty of an American truck compared to a Toyata is unquestionably in favor of the Toyota.

Also I DO NOT HAUL A DAMN THING. So hauling for me is a moot point.

For the record I get around 18-21 mpg depending on how I drive that tankfull and if I run the 4x4 or not.